Half to



UNITED STATES PATENT Ormes.

THEODORE E. BUTTON, OF VATERFORD, NEV YORK, ASSIGNOR OF ONE- HALF TO CHARLES R. BUTTON, OF SAME PLACE.

BOILER. I

SPECIFICATION forming part of Letters Patent No. 459,561, dated September 15, 1891.

Application filed December 10, 1890l Serial No. 374,180. (No model.)

To all tch/'0711, t may concern.-

Be it known that I, THEODORE E. BUTTON, a citizen of the United States, residing at NVaterford, county of Saratoga, and State of New York, have invented certain new and useful Improvements in Boilers, of which the following is a specication.

My invention relates to such improvements; and it consists of the novel construction and combination of parts hereinafter described and subsequently claimed.

Reference may be had to the accompanying drawings andthe letters of reference marked thereon,which form a part of this specication.

Similar letters refer to similar parts in the several figures therein.

My present application relates to an improvement in the boiler shown and described in United States Patent No. 387,393, issued to me August 7, 1888, to which reference may be had. The construction of such `boiler comprises two rows of water tubes or loops depending from the crown-sheet of the boiler, one row inclosing the other, the loops of the outer row being longer than those of the inner ,row and extending downward to the firegrate; The loops of the outer row were provided with connecting-webs and lapping longitudinal flanges, thereby forming a continuous wall inclosing the fire-box. The rows of loops were inclosed by a depending portion of theV boiler formed of two concentric shells, the inner shell depending from the periphery of the crown-sheet. The space between such,4 shells communicated with the water and steam chamberor dome of the boiler and when in use comprised a water-leg surrounding the furnace. The exposed surface of the inner shell, being in contact with the heated gases from the furnace, was a heat-absorbing or lire surface, while the exposed surface of the outer shell, being in contact with the atmosphere, formed a radiating-surface. As the inner shell was inclosed within the outer, the radiating-surfacewas greater than the fire-surface, both being plain. The efficiency of the boiler can be largely increased by oorrugating the inner shell of the water-leg having the firesurface and leaving the outer shell having the radiating-surface plain. Such form of construction I have shown in the accompanying drawings, in which- Figure 1 is a central vertical section of my improved boiler, taken on the broken line 1 1 in Fig. 2. Fig. 2 is a horizontal cross-section of the same, taken on the broken line 2 2in Fig. 1. Figs. 3 and et are respectively outer and inner views of one of myimproved water tubes or loops.

Referring to the drawings, A is the dome, which may be a water-chamber or a water and steam chamber, and B is the furnace. The furnace is provided with a fire-box composed of a circular row of water tubes or loops B', depending from the crown-sheet or diaphragm A', and the fire-grate Bisurroundcd by the lower portions of such loops. The loops B form the vertical walls ot' the firebox and each are provided with a web a, which fills the space between the branches of the loop to the height desired for the fire-box. The loops are also each provided with longitudinal flanges a', corresponding in height with the web a, diametrically opposed to each other and adapted to engage similar flanges on the contiguous loops, thereby forming a continuous wall inclosing the fire-box. A row of similar depending loops B3 surrounds the lower portion of a fuel-supply cylinder O, which extends from the top of the boiler down through the dome and upper portion of the furnace into the lire-box.

In Fig. 2 I have shown only portions of the rows of loops B and B3, the position of the remaining loops in each row being indicated by dottedlines.

l The furnace is inclosed by a wall or waterleg composed of a series or row of Water tubes or loops B4, extending around the same. The tubes or loops B4 depend from the crown-sheet and communicate with the interior of the dome. The branches of the individual loops in the furnace-inclosing water-leg are triangular in horizontal section and so arranged relatively to each other that Aone side of each branch is in line with one side of its suppleinenting branch and the two sides are united throughout their length to form an unbroken outer wall of the loop. Each loop or tube is provided with longitudinal flanges b, extend- IOO ing along the vertical edges of its outer wall, adapted to lap similar anges on the contiguy ous loops, the lapping flanges and the outer the inner shell ot' such water-leg, the spaces between lthe vseveral branches giving such shell a corrugated surface. The inner shell of the boiler, which also forms the inner Wall of the water-leg, being corrugated, presents an extensive surface to the heated gases from the furnace, while the outer shell, being approximately plain, presents a comparatively small area of radiating-surface to the atmosphere.

The base of the furnace comprises the ashpit D, the horizontal flue D', and the escapeiiue D2.

It will be readily seen that by my improved form of construction I have greatly increased the area of fire-surface over that shown in my said patent, No. 387,393, without materially increasing the area of the iadiatingsurface ofn the same, thereby greatly increasing the eiciencyof the boiler. The upper ends b of the loops are contracted and screw-threaded to fit similarly-threaded apertures in the f crown-sheet.

In constructing a water-leg of my improved loops or tubes the alternate loops or tubes are screwed into the crown-sheet until within a quarter-turn of their seats. The intervening loops are then screwed fully to their seats,

after which the first-mentioned loops are given their last quarter-turn, thereby seating them and making the tlange's of each loop lap the iian ges of the contiguous loops. The loops or tubes thus have their corrugated inner walls entirely within the furnace, exposing to the atmosphere only the plain surfaces of their outer walls.

My improved boiler is especially adapted for the use of steam or hot Water for heating purposes.

VVhatI claim as new, and desire to secure by Letters Patent, is-

l. In a boiler comprising a dome and a subjacent heating-furnace, an outer water-leg consisting of a series of water-loops communieating at their upper ends with the interior of the dome and joined exteriorly along the vertical edges of their outer walls by lapping j flanges, the outer Walls of the individual tubes being plain and approximately in line with the lapping iianges, and the inner Walls being corrugated, substantially as described.

2. A water-circulating tube or loop having an indented inner wall and a plain outer Wall aiid provided with a longitudinal iiauge along each vertical edge of the outer wall, substantially as described.

In testimony whereof I have hereunto set my hand this 6th day of December, 1890.

THEO. E. BUTTON.

Witnesses:

GEO. E. HoLRovD, CHAs. R. BUTTON. 

